The better one; that which is better.
the Natural History Museum book is by far the better of the two
Of a more excellent or effective type or quality.
hoping for better weather
superior,finer,of higher quality,greater,in a different class,one step ahead
More excellently or effectively.
Johnny could do better if he tried
to a higher standard,in a finer way,in a superior way
Improve on or surpass (an existing or previous level or achievement)
bettering his previous time by ten minutes
surpass,improve on,beat,exceed,excel,top,cap,trump,eclipse,outstrip,outdo,outmatch,go one better than